#mask {
  position:absolute;
  left:0;
  top:0;
  z-index:9000;
  background-color:#000;
  display:none;
}

#boxes .window {
  position:absolute;
  left:0;
  top:0;
  width:440px;
  height:200px;
  display:none;
  z-index:9999;
  padding:20px;
}

#boxes #dialog {
  width:420px;
  height:350px;
  padding:10px;
  background-color:#ffffff;
}

/*  For change grade modal dialog box    */
#changegradebox .window {
  position:absolute;
  left:0;
  top:0;
  width:400px;
  height:200px;
  display:none;
  z-index:9999;
  padding:20px;
}

#changegradebox #dialog {
  width:225px;
  height:150px;
  padding:10px;
  background-color:#ffffff;
}